1 files changed, 29 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/linux/ptrace.c b/libc-top-half/musl/src/linux/ptrace.c
new file mode 100644
index 0000000..a3f393d
--- /dev/null
+++ b/libc-top-half/musl/src/linux/ptrace.c
@@ -0,0 +1,29 @@
+#include <sys/ptrace.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include "syscall.h"
+
+long ptrace(int req, ...)
+{
+	va_list ap;
+	pid_t pid;
+	void *addr, *data, *addr2 = 0;
+	long ret, result;
+
+	va_start(ap, req);
+	pid = va_arg(ap, pid_t);
+	addr = va_arg(ap, void *);
+	data = va_arg(ap, void *);
+	/* PTRACE_{READ,WRITE}{DATA,TEXT} (16...19) are specific to SPARC. */
+#ifdef PTRACE_READDATA
+	if ((unsigned)req - PTRACE_READDATA < 4)
+		addr2 = va_arg(ap, void *);
+#endif
+	va_end(ap);
+
+	if (req-1U < 3) data = &result;
+	ret = syscall(SYS_ptrace, req, pid, addr, data, addr2);
+
+	if (ret < 0 || req-1U >= 3) return ret;
+	return result;
+}